[PATCH] ubi: Embed ubi_debug_info field in ubi_device struct
Ezequiel Garcia
elezegarcia at gmail.com
Wed Nov 28 07:18:30 EST 2012
ubi_debug_info struct was dynamically allocated which
is always suboptimal, for it tends to fragment memory
and make the code error-prone.
Fix this by embedding it in ubi_device struct.
Cc: Artem Bityutskiy <dedekind1 at gmail.com>
Signed-off-by: Ezequiel Garcia <elezegarcia at gmail.com>
---
drivers/mtd/ubi/build.c | 9 +-------
drivers/mtd/ubi/debug.c | 34 +++---------------------------
drivers/mtd/ubi/debug.h | 52 +++++-----------------------------------------
drivers/mtd/ubi/ubi.h | 40 +++++++++++++++++++++++++++++++++++-
4 files changed, 50 insertions(+), 85 deletions(-)
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 9003f98..3eac8774 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -985,14 +985,10 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
if (!ubi->fm_buf)
goto out_free;
#endif
- err = ubi_debugging_init_dev(ubi);
- if (err)
- goto out_free;
-
err = ubi_attach(ubi, 0);
if (err) {
ubi_err("failed to attach mtd%d, error %d", mtd->index, err);
- goto out_debugging;
+ goto out_free;
}
if (ubi->autoresize_vol_id != -1) {
@@ -1053,8 +1049,6 @@ out_detach:
ubi_wl_close(ubi);
ubi_free_internal_volumes(ubi);
vfree(ubi->vtbl);
-out_debugging:
- ubi_debugging_exit_dev(ubi);
out_free:
vfree(ubi->peb_buf);
vfree(ubi->fm_buf);
@@ -1132,7 +1126,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
ubi_free_internal_volumes(ubi);
vfree(ubi->vtbl);
put_mtd_device(ubi->mtd);
- ubi_debugging_exit_dev(ubi);
vfree(ubi->peb_buf);
vfree(ubi->fm_buf);
ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 26908a5..63cb1d7 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -217,32 +217,6 @@ void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
pr_err("\t1st 16 characters of name: %s\n", nm);
}
-/**
- * ubi_debugging_init_dev - initialize debugging for an UBI device.
- * @ubi: UBI device description object
- *
- * This function initializes debugging-related data for UBI device @ubi.
- * Returns zero in case of success and a negative error code in case of
- * failure.
- */
-int ubi_debugging_init_dev(struct ubi_device *ubi)
-{
- ubi->dbg = kzalloc(sizeof(struct ubi_debug_info), GFP_KERNEL);
- if (!ubi->dbg)
- return -ENOMEM;
-
- return 0;
-}
-
-/**
- * ubi_debugging_exit_dev - free debugging data for an UBI device.
- * @ubi: UBI device description object
- */
-void ubi_debugging_exit_dev(struct ubi_device *ubi)
-{
- kfree(ubi->dbg);
-}
-
/*
* Root directory for UBI stuff in debugfs. Contains sub-directories which
* contain the stuff specific to particular UBI devices.
@@ -295,7 +269,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
ubi = ubi_get_device(ubi_num);
if (!ubi)
return -ENODEV;
- d = ubi->dbg;
+ d = &ubi->dbg;
if (dent == d->dfs_chk_gen)
val = d->chk_gen;
@@ -341,7 +315,7 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
ubi = ubi_get_device(ubi_num);
if (!ubi)
return -ENODEV;
- d = ubi->dbg;
+ d = &ubi->dbg;
buf_size = min_t(size_t, count, (sizeof(buf) - 1));
if (copy_from_user(buf, user_buf, buf_size)) {
@@ -398,7 +372,7 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
unsigned long ubi_num = ubi->ubi_num;
const char *fname;
struct dentry *dent;
- struct ubi_debug_info *d = ubi->dbg;
+ struct ubi_debug_info *d = &ubi->dbg;
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
@@ -471,5 +445,5 @@ out:
void ubi_debugfs_exit_dev(struct ubi_device *ubi)
{
if (IS_ENABLED(CONFIG_DEBUG_FS))
- debugfs_remove_recursive(ubi->dbg->dfs_dir);
+ debugfs_remove_recursive(ubi->dbg.dfs_dir);
}
diff --git a/drivers/mtd/ubi/debug.h b/drivers/mtd/ubi/debug.h
index 0add8d8..33f8f3b 100644
--- a/drivers/mtd/ubi/debug.h
+++ b/drivers/mtd/ubi/debug.h
@@ -60,51 +60,11 @@ void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type);
void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req);
int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
int len);
-int ubi_debugging_init_dev(struct ubi_device *ubi);
-void ubi_debugging_exit_dev(struct ubi_device *ubi);
int ubi_debugfs_init(void);
void ubi_debugfs_exit(void);
int ubi_debugfs_init_dev(struct ubi_device *ubi);
void ubi_debugfs_exit_dev(struct ubi_device *ubi);
-/*
- * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
- * + 2 for the number plus 1 for the trailing zero byte.
- */
-#define UBI_DFS_DIR_NAME "ubi%d"
-#define UBI_DFS_DIR_LEN (3 + 2 + 1)
-
-/**
- * struct ubi_debug_info - debugging information for an UBI device.
- *
- * @chk_gen: if UBI general extra checks are enabled
- * @chk_io: if UBI I/O extra checks are enabled
- * @disable_bgt: disable the background task for testing purposes
- * @emulate_bitflips: emulate bit-flips for testing purposes
- * @emulate_io_failures: emulate write/erase failures for testing purposes
- * @dfs_dir_name: name of debugfs directory containing files of this UBI device
- * @dfs_dir: direntry object of the UBI device debugfs directory
- * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
- * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
- * @dfs_disable_bgt: debugfs knob to disable the background task
- * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
- * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
- */
-struct ubi_debug_info {
- unsigned int chk_gen:1;
- unsigned int chk_io:1;
- unsigned int disable_bgt:1;
- unsigned int emulate_bitflips:1;
- unsigned int emulate_io_failures:1;
- char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
- struct dentry *dfs_dir;
- struct dentry *dfs_chk_gen;
- struct dentry *dfs_chk_io;
- struct dentry *dfs_disable_bgt;
- struct dentry *dfs_emulate_bitflips;
- struct dentry *dfs_emulate_io_failures;
-};
-
/**
* ubi_dbg_is_bgt_disabled - if the background thread is disabled.
* @ubi: UBI device description object
@@ -114,7 +74,7 @@ struct ubi_debug_info {
*/
static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
{
- return ubi->dbg->disable_bgt;
+ return ubi->dbg.disable_bgt;
}
/**
@@ -125,7 +85,7 @@ static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
*/
static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
{
- if (ubi->dbg->emulate_bitflips)
+ if (ubi->dbg.emulate_bitflips)
return !(random32() % 200);
return 0;
}
@@ -139,7 +99,7 @@ static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
*/
static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
{
- if (ubi->dbg->emulate_io_failures)
+ if (ubi->dbg.emulate_io_failures)
return !(random32() % 500);
return 0;
}
@@ -153,18 +113,18 @@ static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
*/
static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
{
- if (ubi->dbg->emulate_io_failures)
+ if (ubi->dbg.emulate_io_failures)
return !(random32() % 400);
return 0;
}
static inline int ubi_dbg_chk_io(const struct ubi_device *ubi)
{
- return ubi->dbg->chk_io;
+ return ubi->dbg.chk_io;
}
static inline int ubi_dbg_chk_gen(const struct ubi_device *ubi)
{
- return ubi->dbg->chk_gen;
+ return ubi->dbg.chk_gen;
}
#endif /* !__UBI_DEBUG_H__ */
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index d28b002..8c78386 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -85,6 +85,13 @@
#define UBI_UNKNOWN -1
/*
+ * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
+ * + 2 for the number plus 1 for the trailing zero byte.
+ */
+#define UBI_DFS_DIR_NAME "ubi%d"
+#define UBI_DFS_DIR_LEN (3 + 2 + 1)
+
+/*
* Error codes returned by the I/O sub-system.
*
* UBI_IO_FF: the read region of flash contains only 0xFFs
@@ -342,6 +349,37 @@ struct ubi_volume_desc {
struct ubi_wl_entry;
/**
+ * struct ubi_debug_info - debugging information for an UBI device.
+ *
+ * @chk_gen: if UBI general extra checks are enabled
+ * @chk_io: if UBI I/O extra checks are enabled
+ * @disable_bgt: disable the background task for testing purposes
+ * @emulate_bitflips: emulate bit-flips for testing purposes
+ * @emulate_io_failures: emulate write/erase failures for testing purposes
+ * @dfs_dir_name: name of debugfs directory containing files of this UBI device
+ * @dfs_dir: direntry object of the UBI device debugfs directory
+ * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
+ * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
+ * @dfs_disable_bgt: debugfs knob to disable the background task
+ * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
+ * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
+ */
+struct ubi_debug_info {
+ unsigned int chk_gen:1;
+ unsigned int chk_io:1;
+ unsigned int disable_bgt:1;
+ unsigned int emulate_bitflips:1;
+ unsigned int emulate_io_failures:1;
+ char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
+ struct dentry *dfs_dir;
+ struct dentry *dfs_chk_gen;
+ struct dentry *dfs_chk_io;
+ struct dentry *dfs_disable_bgt;
+ struct dentry *dfs_emulate_bitflips;
+ struct dentry *dfs_emulate_io_failures;
+};
+
+/**
* struct ubi_device - UBI device description structure
* @dev: UBI device object to use the the Linux device model
* @cdev: character device object to create character device
@@ -548,7 +586,7 @@ struct ubi_device {
struct mutex buf_mutex;
struct mutex ckvol_mutex;
- struct ubi_debug_info *dbg;
+ struct ubi_debug_info dbg;
};
/**
--
1.7.8.6
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